Men wearing sport coats and jeans: no. You want to be formal? Fine, wear a sport coat. You want to be casual? Fine, wear jeans. Pick one, and stand by your choice—Like A Real Man.
Wearing a sport coat with jeans does not make you look "Business Casual" or "Casual Friday" or "Relaxed Business" or "Business and Pleasure." It makes you look like a dork.
One or the other. Not both.
Yesterday, Gawker staffers had a lengthy and heated internal argument on this point, pitting the arbiters of hard truth against those guilt-ridden (unnamed) men on staff who may themselves be guilty of sporting this particular sartorial combination from time to time. Suffice it to say that we had a passionate back-and-forth that may or may not have descended into rude ad hominem attacks that resulted in the personal style of a veteran staff member being described as "homeless." Well, I'll take homeless over "dorkzilla" any day. That's for sure.
The more fiercely a man argues in favor of wearing sport coats and jeans together, the more plainly the flaws of his character are revealed.